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Re: [cw_bugs] Re: Vibroplex Pendulum Spring Mod for Slower Speed

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  • Earl Needham
    Thanks for that! My 56 Presentation has a small area where the plating is missing, and I made it worse trying to cleans something off where it really wasn t
    Message 1 of 9 , Jan 28, 2011
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      Thanks for that! My '56 Presentation has a small area where the plating is missing, and I made it worse trying to cleans something off where it really wasn't dirty. I'll have to look into replating it when I get home.

      Vy 7 3
      Earl
      KD5XB

      KD5XB -- Earl Needham http://groups.yahoo.com/group/cw_bugs Quoting from the Coast Guard: ZUT Posted via Blackberry


      From: "w2blc" <w2blc@...>
      Sender: cw_bugs@yahoogroups.com
      Date: Sat, 29 Jan 2011 01:06:38 -0000
      To: <cw_bugs@yahoogroups.com>
      ReplyTo: cw_bugs@yahoogroups.com
      Subject: [cw_bugs] Re: Vibroplex Pendulum Spring Mod for Slower Speed

       

      This company might just offer the perfect answer for replating the "gold" plate
      on a Vibroplex Presentation:
      http://www.caswellplating.com/pickakit/index.html

      --- In cw_bugs@yahoogroups.com, "richard_meiss" <wb9lpu@...> wrote:
      >
      > Hi, All -
      >
      > More smiles here - I checked my Original Presentation, and it has the La Hiff spring. Which brings me to the next question - is the gold base plate really gold plated? I hate to try to polish it and find out that the gold layer is only a micron thick. Has anyone priced a replating job for just the decorative plate?
      >
      > 73 de Rich, WB9LPU
      >
      >
      > --- In cw_bugs@yahoogroups.com, wz4cw@ wrote:
      > >
      > >
      > >
      > >      Several days ago, two persons were telling how they each had modified the pendulum spring on a Vibroplex bug to slow its speed.  One had filed notches in the spring, and the other had ground a slot in the spring.  While this type of non-reversable modification to the pendulum spring is not advised, they were correct in looking at the pendulum spring as a way to adjust the pendulum oscillation period.  This is in addition to the placement of weights on the pendulum itself.
      > >
      > >      Actually, Vibroplex had already addressed this modification concern years ago.  In 1940, John La Hiff had patented a new type of adjustable pendulum spring.  It was first used in a new model Presentation Vibroplex beginning in 1948.  This bug looked like a Deluxe Original, but it also had a gold plated brass plate and the La Hiff adjustable pendulum spring.  One end of the spring was riveted to the rear part of the pendulum, but the other end of the spring slipped into a slot in the front part of the pendulum and was retained by two screws.  This adjustable spring could be made longer or shorter to control the speed.  The Presentation was made this way until 1978.  Beginning in 1979, Presentation models ceased to feature the La Hiff spring.
      > >
      > >      Presentation models with the La Hiff adjustable spring are scarce.  However, one can really make a Vibroplex collection stand out.  I'm smiling because I have one.
      > >
      > >
      > >
      > > 73  Carl  WZ4CW      SKCC 918     FISTS 13491
      > >  
      > >
      > >
      > >
      > > .
      > >
      >

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